to OPJOSE

There are so many unknowns here as the OP didn't give a lot of info?

How old are the batteries and plane? 36 hours old

Was the plane owned and run by someone else? no

When was the last time the batteries in the plane were replaced? n/a

Were the batteries over left charging for MUCH too long? charged for 12 hours if that

Did the charge indicator light ( already asked ).

Was the plane accidentally left "ON"? no

Has a new battery pack been tried? no, just bought the plane

What is the capacity of the battery ( asked ) and charger?